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It was because of the shielding on the entire back.
It was a huge chunk of thick glass. The flatter they made them, the thicker the glass had to be to withstand the vacuum.
No, because the front was flat and rather large, the tube was appropriately long and heavy, Shielding was just thin sheets, nothing to write home about. The mounts holding the tube though were massive and distributed the weight both to the feet and the handles on the sides.